JPS637244Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention This invention relates to a lid tightening device for a sterilizer, which tightly tightens the lid to the opening of a pressure vessel in a sterilizer or the like.

Technical background and problems of the invention Conventionally, blood stains and chemicals adhering to medical instruments after use are washed away using a jet jet of high-pressure steam and hot water, and then the instruments are sterilized and dried under high-temperature and high-pressure steam. There are cleaning and sterilizing devices that do this. In addition, there are popular types that omit cleaning of instruments and only have the function of sterilizing and drying them. As shown in the schematic external view of FIG. 1, in this type of container, a lid 4 is provided at an opening 2 of a pressure vessel 1 via a packing 3 so as to be openable and closable. Then, used medical instruments (not shown) are stored in the pressure vessel 1 and are sequentially washed, sterilized, and dried.

On the other hand, during each process of cleaning, sterilization, and drying, the inside of the pressure vessel 1 must be kept at high pressure. must be tightened. FIGS. 2 and 3 show an example of the tightening means. That is, although not fully shown in the drawings, a tensioning lid 6 is removably attached to the opening 5 of the pressure vessel. The tensioning lid 6 includes a lid plate 7 that closes the opening 5, a boss 9 rotatably held on a central axis 8 of the lid plate 7, and a plurality of radial rods movably held on the boss 9. 10 and a guide 11 fixed to the cover plate 7 to guide the radial rods 10 radially and limit their movable range. One end of the radial rod 10 is attached to a support end 12 held by the boss 9, and the other end is attached to a flange 1 formed on the pressure vessel.
3 and a tapered free end 14 which engages with the opening 3.

In such a configuration, when the lid plate 7 is brought into contact with the opening 5 and the boss 9 is rotated, the radial rod 10 moves in the rotation direction, and the free end 14 moves toward the flange 1.
It protrudes in three directions and engages in sliding contact with this flange 13. Since the free end 14 is tapered, the more the free end 14 protrudes, the deeper the engagement between the free end 14 and the flange 13 becomes, and the lid plate 7 comes into close contact with the opening 5. That is, with the guide 11 as the fulcrum, the supporting end 12 is the point of effort, and the free end 14 is the fulcrum.
By acting as a point of action, the tensioning lid 6 is tensioned to the pressure vessel. However, since a strong frictional force is applied to the sliding contact surface between the free end 14 and the flange 13, durability is poor.Moreover, a large force is required to rotate the boss 9, and if this force is insufficient, A disadvantage is that the tensioning lid cannot be tightened accurately.

Next, another example is shown in FIG. The same or corresponding parts as in FIGS. 2 and 3 are denoted by the same reference numerals and explanations will be omitted. This involves screwing together a central shaft 15 that is a male screw and a boss 16 that is a female screw, and rotatably fitting a sliding ring 18 that movably holds a plurality of radial rods 17 into the boss 16. Further, the radial rods 17 are arranged radially and a guide 19 is fixed to the lid plate 7 to limit the movable range of the radial rods 17 only in the radial direction, thereby forming the tension lid 20. The radial rod 17 is guided by the guide 19 so that the free lid 14 projects toward the lid plate 7.

In such a configuration, when the boss 16 is rotated, the sliding ring 18 moves in the direction of the central axis 15 while slidingly contacting the boss 16. Here, cover plate 7 is placed in opening 5.
When the sliding contact ring 18 is moved in the direction of the cover plate 7 while making contact with the radial rod 17, the radial rod 17 expands in the radial direction using the guide 19 as a fulcrum, and the free end 14 touches the flange 1.
3, and when this engagement deepens, the cover plate 7 closes in the opening 5.
closely adhere to. That is, the tensioning lid 20 is tightened to the pressure vessel by using the guide 19 as a fulcrum, the supporting end 12 acting as a point of force, and the free end 14 acting as a point of action.
This is due to the screwing force that rotates 6. Therefore, there is an advantage that a large force is not required to tighten the tensioning lid 20 to the pressure vessel, and the durability is excellent. However, there is a drawback that it takes time to attach and detach the tensioning lid 20, and operability is poor.

Purpose of the invention This invention was created in view of the above points. When securing the lid plate to the pressure vessel, there is less sliding of each part, and the operation time can be shortened with a small operating force. The purpose is to obtain a lid tightening device in a sterilizer.

Summary of the invention This invention uses rotational force to move the radial rod to a position where it can engage with the flange, and after movement, the radial rod and flange are engaged by the action of a ram due to screwing force, and the opening of the pressure vessel is closed. Since the plates are brought into close contact with each other, there is less sliding between the radial rod and the flange when tightening the cover plate to the pressure vessel, and the structure allows for shorter operation time with less operating force. This is what I did.

Embodiment of the invention An embodiment of the invention will be described based on FIGS. 5 to 7. The pressure vessel (not shown) is provided with a circular opening 30, and is provided with a flange 31 that protrudes beyond the opening 30 and is integral with the pressure vessel.
is fixed. A tension device 33 that tightly closes the opening 30 is detachably attached to the pressure vessel.

The locking lid 33 has a lid plate 34 provided with a contact means for tightly closing the opening 30 with the lid plate 34. That is, the cover plate 34 has a disc shape that closes the opening 30, and a packing 35 is embedded in the portion that contacts the opening 30. Further, a screw shaft 36 is fixed to the center of the cover plate 34, and a boss 37 is rotatably screwed into the screw shaft 36. The boss 37 has a cylindrical shape with steps, a plurality of handles 38 are fixed to the thick part, and the outer peripheral surface of the thin part becomes a sliding surface 39, and a part of the sliding surface 39 has a leaf spring. 4
0 is installed. Then, the sliding contact surface 39
A sliding ring 41 is provided which is rotatably fitted into the plate spring 40 and whose rotational movement is suppressed by being pressed by the leaf spring 40. It's being stopped.

A plurality of radial rods 43 are movably held in the sliding ring 41. These radial rods 43 have a spherical support end 44 held by the sliding ring 41 at one end, a tapered free end 45 at the other end, and a guide 46 fixed to the cover plate 34. are guided radially. Also, by this guide 46, the radiation rod 4
3 is guided such that the free ends 45 of these radial rods 43 protrude toward the cover plate 34, and the free ends 45 are connected to the flange 31 under predetermined conditions.
The whole is configured to engage.

Further, a cover 47 is attached to a predetermined position of the cover plate 34 and the boss 37, and covers and protects a mechanism that is a contact means provided on the cover plate 34.

In this configuration, the guide 46 is aligned with the stop bar 32 fixed to the flange 31, and the clamping lid 33 is set in the opening 30 of the pressure vessel. When the boss 37 is rotated clockwise using the handle 38, the radial rod 43 moves in two steps.
That is, as the boss 37 rotates, the sliding ring 4
1 rotates, and as a result, the radial rod 43 moves in the circumferential direction, is guided by the guide 46, and protrudes radially. The movable radial rod 43 stops when it comes into contact with the guide 46 and the stop rod 32, but at this time the sliding ring 41 also stops rotating. Then, when the boss 37 is further rotated, the sliding ring 41 is moved to the boss 3.
While a slip is generated between the sliding surface 39 of the radial rod 43 and the leaf spring 40, the support end 44 of the radial rod 43 is pressed toward the cover plate 34 by being pushed by the bearing 42. As a result, the radial rod 43 performs a ramming action using the guide 46 as a fulcrum, expands in the radial direction, and engages with the flange 31. At this time, the cover plate 34 comes into close contact with the opening 30 due to the action of the radial rod 43.

On the other hand, when the boss 37 is rotated to the left, the radial rod 43
While the engagement force between the boss 41 and the flange 31 is strong, the sliding ring 41 does not rotate, but moves in a direction away from the cover plate 34 while causing a slip between the boss 41 and the boss 41. Then, when the engagement force between the radial rod 43 and the flange 31 becomes weaker, the sliding ring 41 is pushed by the leaf spring 40 and rotates together with the boss 41, causing the radial rod 43 to move in the circumferential direction. The moving radial rod 43 stops when a portion thereof comes into contact with the sliding ring 41, causing a slip between the sliding ring 41 and the boss 37 again. At this time, the engagement between the radial rod 43 and the flange 31 is released, so that the clamping lid 33 can be removed from the pressure vessel.

As described above, according to the present invention, the radial rod 43 is once moved to the position where it engages with the flange 31 by rotational force, and then the radial rod 43 and the flange 31 are engaged by screwing force, so that the radial rod 43 and the flange 31 are engaged with each other by screwing force. When tightening the tensioning lid 33, the number of sliding parts is reduced, which increases durability, and it can be operated in a short time with a small operating force.

Effects of the invention Since this invention is constructed as described above, the lid plate can be accurately tightened to the pressure vessel without fear of erroneous operation due to improved operability, and no unreasonable frictional force is applied at that time. It has excellent durability, and furthermore, because of its simple mechanism, production costs can be reduced and miniaturization is easy, allowing it to be easily used in small-sized pressure vessels.

[Brief explanation of the drawing]

Fig. 1 is a schematic external view showing an example of a sterilization device, Fig. 2 is a vertical side view of a lid tightening device showing an example of the conventional technology, and Fig. 3 is a front view showing the state of engagement between the radial rod and the flange. , FIG. 4 is a vertical side view showing another example,
Fig. 5 is a longitudinal sectional side view of the lid tensioning device showing an example of the present invention, Fig. 6 is a sectional view taken along the line A-A' showing the fitted state of the boss and the sliding ring, and Fig. 7 is the radial rod and FIG. 3 is a front view showing a state of engagement with a flange. 30... Opening, 31... Flange, 32... Stop bar (stop part), 34... Cover plate, 36... Screw shaft,
37...boss, 41...sliding ring, 43...radial rod, 46...guide.

Claims (1)

[Scope of utility model registration request] A lid plate that closes the opening of the pressure vessel is provided, a screw shaft is provided on the lid plate in a direction perpendicular to the plane of the lid plate, and a boss that is screwed onto the screw shaft and moves forward and backward is provided,
A sliding ring that fits onto this boss with a certain sliding resistance is provided, a plurality of radial rods each having one end movably held is provided on this sliding ring, and the middle portion of these radial rods is slidable. A guide that is movably and rotatably held is fixedly provided on the cover plate, and a flange with which the tips of the radial rods are engaged and disconnected from the outer periphery of the opening of the pressure vessel, and movement of these radial rods in the circumferential direction. A lid tightening device for a sterilizer, characterized in that it is provided with a stop portion for stopping the lid.